/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.visitor;

import proguard.classfile.*;

import java.util.Set;

/**
 * This <code>ClassVisitor</code> sets the version number of the program classes that it visits.
 *
 * @author Eric Lafortune
 */
public class ClassVersionSetter implements ClassVisitor {
    private final int classVersion;

    private final Set newerClassVersions;

    /**
     * Creates a new ClassVersionSetter.
     * 
     * @param classVersion the class version number.
     */
    public ClassVersionSetter(int classVersion) {
        this(classVersion, null);
    }

    /**
     * Creates a new ClassVersionSetter that also stores any newer class version numbers that it encounters while
     * visiting program classes.
     * 
     * @param classVersion the class version number.
     * @param newerClassVersions the <code>Set</code> in which newer class version numbers can be collected.
     */
    public ClassVersionSetter(int classVersion, Set newerClassVersions) {
        this.classVersion = classVersion;
        this.newerClassVersions = newerClassVersions;
    }

    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass) {
        if (programClass.u4version > classVersion && newerClassVersions != null) {
            newerClassVersions.add(new Integer(programClass.u4version));
        }

        programClass.u4version = classVersion;
    }

    public void visitLibraryClass(LibraryClass libraryClass) {
        // Library classes don't have version numbers.
    }
}
